Thank you Psych for your advice! I remember that you've mentioned once that you prefer magnesium citrate, so where do you buy it? If you buy it online, could you please give me the link? (Maybe somebody will be able to order it for me.) I saw that in some products (especially, pills and capsules) there are nasty ingredients that I'd like to avoid.
As to a PayPal account, I've just tried to create one, but they (as everywhere) require a credit card info that I'm not able to provide, so my registration failed. In theory, I could try to open an account in another country, as some local people do. But unfortunately, I don't have money for this. Normally, when I need something really important (that is small in size and affordable financially to me) that is not available here, I try to ask some of my friends. But, of course, I cannot do it frequently by a number of reasons... As to EFT, the bank fees here it's another story (as in most African countries), so I prefer to avoid it when I can.